Flipping flops for some?

At the undergraduate level, the Khan-Academy style flipped classroom (extremely loosely defined as "watch videos alone, then come to class to do problems") gets skeptical comments and comments on the comments at I’ll flip something § Unqualified Offerings

I have several colleagues who are doing the flipped classroom this year and it’s bombing. Basically, they say it’s working great for motivated students who love going at their own pace with online “modules” and are happy to do problems in class. But, anything will work for motivated students.
For most of the lot, they say, it’s a failure because they come to these problem sessions (what used to be lectures) and they haven’t read the material and now you have to sort-of teach them in digest form on the fly if their time is not to be completely wasted. So yes, I am unimpressed with the flipped classroom.

This kind of thing obviously wants watching; I would like to know what sort of videos are in use here. It sounds like this might be simply institutionalized one-hour talking-head lectures made available to students on the web. If so, I would expect such failures...but if the results apply to actual Khan-Academy style small segments in Khan's own "don't see me, see what I'm seeing" style, with questions to answer before passing to the next segment, then there's at least a potential Big Problem. And of course this is possible. And if there's a Big Problem, it may or may not have a solution (are your online answers part of your grade? Do you need to check in to a scheduled lab to do your online work? etc. Khan's own belief, at the lower level where he's working, seems to be that scheduled labs, total maybe 20% of the day, are about right. But that's not the way some schools are trying it. Hmm.)
I dunno.